Vulcanized rubber and multistage rocket: what they have in common

1. Step 1. Vulcanized rubber — is material for — Weather balloon. The envelope is rubber or latex.
2. Step 2. Weather balloon — is made of — Hydrogen. Filled with hydrogen or helium.
3. Step 3. Hydrogen — is used in — Saturn V. Hydrogen stages.
4. Step 4. Saturn V — is a kind of — Multistage rocket. A rocket.

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